I could hazard you could hazard she could hazard we could hazard you could hazard they could hazard
V-ing form
I could be hazarding you could be hazarding she could be hazarding we could be hazarding you could be hazarding they could be hazarding
Perfect
I could have hazarded you could have hazarded she could have hazarded we could have hazarded you could have hazarded they could have hazarded
V-ing perfect
I could have been hazarding you could have been hazarding she could have been hazarding we could have been hazarding you could have been hazarding they could have been hazarding
Negation
Simple form
I couldn't hazard you couldn't hazard she couldn't hazard we couldn't hazard you couldn't hazard they couldn't hazard
V-ing form
I couldn't be hazarding you couldn't be hazarding she couldn't be hazarding we couldn't be hazarding you couldn't be hazarding they couldn't be hazarding
Perfect
I couldn't have hazarded you couldn't have hazarded she couldn't have hazarded we couldn't have hazarded you couldn't have hazarded they couldn't have hazarded
V-ing perfect
I couldn't have been hazarding you couldn't have been hazarding she couldn't have been hazarding we couldn't have been hazarding you couldn't have been hazarding they couldn't have been hazarding
Interrogative form
Simple form
could I hazard? could you hazard? could she hazard? could we hazard? could you hazard? could they hazard?
V-ing form
could I be hazarding? could you be hazarding? could she be hazarding? could we be hazarding? could you be hazarding? could they be hazarding?
Perfect
could I have hazarded? could you have hazarded? could she have hazarded? could we have hazarded? could you have hazarded? could they have hazarded?
V-ing perfect
could I have been hazarding? could you have been hazarding? could she have been hazarding? could we have been hazarding? could you have been hazarding? could they have been hazarding?
Interro-negative form
Simple form
couldn't I hazard? couldn't you hazard? couldn't she hazard? couldn't we hazard? couldn't you hazard? couldn't they hazard?
V-ing form
couldn't I be hazarding? couldn't you be hazarding? couldn't she be hazarding? couldn't we be hazarding? couldn't you be hazarding? couldn't they be hazarding?
Perfect
couldn't I have hazarded? couldn't you have hazarded? couldn't she have hazarded? couldn't we have hazarded? couldn't you have hazarded? couldn't they have hazarded?
V-ing perfect
couldn't I have been hazarding? couldn't you have been hazarding? couldn't she have been hazarding? couldn't we have been hazarding? couldn't you have been hazarding? couldn't they have been hazarding?